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Systematic biases in radiometric diameter determinationsRadiometric diameter determinations are presently shown to often be significantly affected by the effect of rotation. This thermal effect of rotation depends not only on the object's thermal inertia, rotation rate, and pole orientation, but also on its temperature, since colder objects having constant rotation rate and thermal inertia will radiate less of their heat on the diurnal than on the nocturnal hemisphere. A disk-integrated beaming parameter of 0.72 is determined for the moon, and used to correct empirically for the roughness effects in thermophysical models; the standard thermal model is found to systematically underestimate cold object diameters, while overstating their albedos.
Document ID
19890051447
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Spencer, John R.
(Hawaii, University Honolulu, United States)
Lebofsky, Larry A.
(Arizona, University Tucson, United States)
Sykes, Mark V.
(Steward Observatory Tucson, AZ, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1989
Publication Information
Publication: Icarus
Volume: 78
ISSN: 0019-1035
Subject Category
Lunar And Planetary Exploration
Accession Number
89A38818
Funding Number(s)
CONTRACT_GRANT: NSG-7114
Distribution Limits
Public
Copyright
Other

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